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iio: core: Introduce STEPS channel, ENABLE mask and INSTANCE event

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These changes are needed to support the functionality of a pedometer.
A pedometer has two basic functionalities: step counter and step detector.

The step counter needs to be enabled and then it will count the steps
in its hardware register. Whenever the application needs to check
the step count, it will read the step counter register. To support the
step counter a new channel type STEPS is added. Since the pedometer needs
to be enabled first so that the hardware can count and store the steps,
we need a specific ENABLE channel info mask.

The step detector will generate an interrupt each time a step is detected.
To support this functionality we add a new event type INSTANCE.

For more information on the Android requirements for step counter and step
detector see:
http://source.android.com/devices/sensors/composite_sensors.html#counter
and http://source.android.com/devices/sensors/composite_sensors.html#detector.

A device that has the pedometer functionality this interface needs to
support is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea
2014-11-10 14:45:32 +02:00
committed by Jonathan Cameron
parent 1843c2f3de
commit a88bfe7858
5 changed files with 28 additions and 0 deletions
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22
Documentation/ABI/testing/sysfs-bus-iio
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@@ -856,6 +856,13 @@ Description:
number or direction is not specified, applies to all channels of
this type.
What: /sys/.../events/in_steps_instance_en
KernelVersion: 3.19
Contact: linux-iio@vger.kernel.org
Description:
Enables or disables step detection. Each time the user takes a step an
event of this type will be generated.
What: /sys/bus/iio/devices/iio:deviceX/trigger/current_trigger
KernelVersion: 2.6.35
Contact: linux-iio@vger.kernel.org
@@ -1095,3 +1102,18 @@ Description:
after application of scale and offset. If no offset or scale is
present, output should be considered as processed with the
unit in milliamps.
What: /sys/.../iio:deviceX/in_steps_en
KernelVersion: 3.19
Contact: linux-iio@vger.kernel.org
Description:
Activates the step counter. After activation, the number of steps
taken by the user will be counted in hardware and exported through
in_steps_input.
What: /sys/.../iio:deviceX/in_steps_input
KernelVersion: 3.19
Contact: linux-iio@vger.kernel.org
Description:
This attribute is used to read the number of steps taken by the user
since the last reboot while activated.